Age and geomorphic history of Meteor Crater, Arizona, from cosmogenic 36Cl and 14C in rock varnish
Abstract
Using cosmogenic 36Cl buildup and rock varnish radiocarbon, we have measured the exposure age of rock surfaces at Meteor Crater, Arizona. Our 36Cl measurements on four dolomite boulders ejected from the crater by the impact yield a mean age of 49.7 ± 0.85 ka, which is in excellent agreement with an average age of 49 ± 3 ka obtained from thermoluminescence studies on shock-metamorphosed dolomite and quartz. These ages are supported by undetectably low 14C in the oldest rock varnish sample.
- Publication:
-
Geochimica et Cosmochimica Acta
- Pub Date:
- September 1991
- DOI:
- 10.1016/0016-7037(91)90387-K
- Bibcode:
- 1991GeCoA..55.2695P
- Keywords:
-
- Carbon 14;
- Chlorine;
- Dolomite (Mineral);
- Meteorite Craters;
- Radioactive Age Determination;
- Metamorphism (Geology);
- Quartz;
- Thermoluminescence